linux-kernel - Re: [PATCH] libata: implement ata_wait_after

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Message-ID: <20070521060202.GA14877@linux-sh.org>
Date:	Mon, 21 May 2007 15:02:02 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Indan Zupancic <indan@....nu>, jeff@...zik.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	garyhade@...ibm.com
Subject: Re: [PATCH] libata: implement ata_wait_after_reset()

On Sat, May 19, 2007 at 09:04:56PM +0200, Tejun Heo wrote:
> Tejun Heo wrote:
> > Yeah, if SCR registers are accessible, 0xff doesn't indicate the device
> > isn't there, so the whole skip-0xff logic probably shouldn't apply in
> > such cases, but we can also achieve pretty good result by just making
> > the first reset tries a bit more aggressive.
> 
> So, here's the patch.
> 
> Paul, can you please test this patch without the previous patch?  Indan,
> this should reduce the resume delay.  Please test.  But you'll still
> feel some added delay compared to 2.6.20 due to the mentioned
> suspend/resume change.
> 
Seems to work ok:

[    0.977254] scsi0 : sata_sil
[    0.980243] scsi1 : sata_sil
[    0.983207] ata1: SATA max UDMA/100 cmd 0xfd000280 ctl 0xfd00028a bmdma 0xfd000200 irq 0
[    0.991183] ata2: SATA max UDMA/100 cmd 0xfd0002c0 ctl 0xfd0002ca bmdma 0xfd000208 irq 0
[    2.578436] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[    2.586828] ata1.00: ata_hpa_resize 1: sectors = 39070080, hpa_sectors = 39070080
[    2.591596] ata1.00: ATA-5: HHD424020F7SV00, 00MLA0A5, max UDMA/100
[    2.598094] ata1.00: 39070080 sectors, multi 0: LBA
[    2.603248] ata1.00: applying bridge limits
[    2.614710] ata1.00: ata_hpa_resize 1: sectors = 39070080, hpa_sectors = 39070080
[    2.619489] ata1.00: configured for UDMA/100
[    2.933096] ata2: SATA link down (SStatus 0 SControl 310)
[    2.936265] scsi 0:0:0:0: Direct-Access     ATA      HHD424020F7SV00  00ML PQ: 0 ANSI: 5
[    2.945002] sd 0:0:0:0: [sda] 39070080 512-byte hardware sectors (20004 MB)
[    2.951473] sd 0:0:0:0: [sda] Write Protect is off
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